Calculators
Random Number Generator
Generate one or many random integers between any minimum and maximum. Enable the "no repeats" option for unique numbers, and see the sum and average of the generated set.
About the Random Number Generator
Generate one or many random integers between any minimum and maximum. Enable "no repeats" to ensure every number in the list is unique. The tool also shows the sum and average of the generated set.
How randomness works in a browser
Numbers are generated using crypto.getRandomValues()
where available, falling back to Math.random().
The cryptographic API produces numbers that are statistically indistinguishable from true randomness
for practical purposes.
For unique numbers, the tool uses a Fisher-Yates shuffle on the range. If you request more unique numbers than the range contains, the count is capped automatically.
Frequently asked questions
How random are the numbers?
Numbers are generated using the browser's crypto.getRandomValues() API, which is cryptographically secure and suitable for any non-cryptographic purpose like games, decisions and statistics. It falls back to Math.random() on very old browsers.
What happens if I request more unique numbers than fit in the range?
The count is automatically capped at the size of the range. For example, requesting 10 unique numbers between 1 and 5 will return all 5 numbers (1, 2, 3, 4, 5) in a random order.